Amphibia
in zoölogy, animals which can live indiscriminately on land or water, or which at one part of their existence live in water and at another on land. It is used by Macleay, Swainson, Huxley, and other modern zoölogists for the fourth great class of aniorder batrachia. It is intermediate bemals corresponding to Cuvier's reptilian tween reptilia and pisces. They have no amnion. Their visceral arches during a longer or shorter period develop fila-